face on的用法和样例：
例句
- I had to put my best face on before my boss although I didn't like him totally.
尽管我不喜欢我的老板，但我不得不在面前是装出十分须从的样子。 - The little girl fell face on into the water.
那个小女孩面朝下落入水中。 - Seeing no change of escape, he put a bold face on the matter and walked directly to me.
他见逃不掉了，便装出一幅对这件事满不在乎的样子，径直朝我走来。 - Her exam results were disappointing but she tried to put a brave face on it.
她的考试成绩令人失望，但却装出若无其事的样子。
